Foldable treadmill



FIG. 1 is a side view of a foldable treadmill showing my new design;

FIG. 2 is a side perspective view thereof;

FIG. 3 is a side view of a foldable treadmill in the upright storage position; and,

FIG. 4 is a side perspective view thereof. 

The ornamental design for an foldable treadmill, as shown and described. 